Just to avoid confusion L. domesticum is a very old composite species with numerous older synonyms. The species name L.parasiticum is a fairly recent proposed name that hasn't been accepted as yet and it is shaping up as if it wont. Duku, lansone. langsat, duku-langsat ,kokosan, longkong and all their respective varieties are considered a ingle species and the 2 sub species in the literature are probably not genuine.

Just to avoid confusion L. domesticum is a very old composite species with numerous older synonyms. The species name L.parasiticum is a fairly recent proposed name that hasn't been accepted as yet and it is shaping up as if it wont. Duku, lansone. langsat, duku-langsat ,kokosan, longkong and all their respective varieties are considered a ingle species and the 2 sub species in the literature are probably not genuine.

Mike, look at plantlist.org. According to that site Lansium parasiticum is now the accepted name and L. domesticum is a synonym.

Oscar you seem to be correct. I looked at this a couple of years ago and the medium confidence only on the plant list and comments I was seeing and the original paper not being fully embraced made me doubt the new name. Some were even listing L.parasiticum as a synonym rather than the reverse. See the examples below. I take it all back.

The name Lansium parasiticum (Osbeck) K.C.Sahni & Bennet has been proposed for this species. It has not been universally accepted yet (2014), so we are maintaining the name Lansium domesticum for the time being

Here is the text run through google translate from the blog, I don't have time to correct it, it is semi-readable:

Longkong is a species of tree with Langsad, with thick bark and no rubber like langsat. Less meat But with a sweet taste. Scientific name is Lansium domesticum Corr, which is the same species is Duku (duku), the sun (Lang) is a separate species. The name is A. Domesticum Pelleg. The name of the Wollongong comes from the language of Yew"Wollongong" of the city of Narathiwat. .

Wollongong and Langsang are the same fruit trees. It is divided into 3 groups:

1. Wollongong The best quality seed with little or no seeds. The leaves are very similar to the dark green. And deep groove. It seems like that. Leaf wavy The group is divided into three types.

- Dried Wollongong is cooked with a glass of sweet meat and sweet aroma. The thick shell is dark yellow and no rubber - Wollongong ripe juice is quite juicy. Bright yellow bark - Longkong Palawan or Wollongong Ripe fruit is soft. The smell is not like the water. Thin crust and a thin rubber

2. Dooku or Telugu leaves quite thick. And dark green like Wollongong. But less wavy The result is quite large. It has a thicker bark than Wollongong. There are many seeds and juicy juices found there are two types.

- DuPer Perfume has a slightly rejuvenated skin, slightly wrinkled skin. - Duo water effect is quite round. The skin is more

durable than Doug . 3. Lang Bang thin than Wollongong. Wave is not pronounced Smaller than Wollongong Ripe fruits are yellowish. The thin shell has a rubbery, 2-3 seeds per plant. The fruit of the tropical rainforest. In Southeast Asia Thailand is the country that can produce the best quality of Wollongong.

Sorry just notice that google translate is butchering some stuff, Wollonggong.. is Longong.Maybe be confusing but in English Longon is 'dragoneye' , but in Thai is Lamyai... very confusing stuff, not sure who did the original transliteration.

Anyways long story short, in the blog states Longgong (a subspecies of Langsat) is the best quality. So where my nursery is selling Longgong Yongmas grafted onto Langsat, Yongmas is likely Yawi language for this semi-seedless no latex variety of Langsat.

In Thailand there are 4 longkong I think such as longkong air and a few langsat such as variety Utteradit.The genetic studies show that it is all one species (which now is L.parasiticum) with a very broad genetic base and the two subspecies are not valid. One Malaysia genetic assessment of 64 accessions showed that even the division into langsat duku duku-landsat and longkong has no genetic basis.

My longkongtree has insect under the bark...i cut all branches where i could see it but now it came back.

How can that be treated?

Assuming your langsat consists primarily of brown bark.- Get a microfiber cloth, or a cloth towel- Mix 1:1:5 Horticulture:Orange oil:Water- Soak the towel in concoction- Gently wipe the bark- If on or under leaves, spray with mister or use a fogger in containment

First i think it was flowers but they never grew. The bark is damaged and it spread.

Now i think it is this:

Insect Pest and Diseases Control. The bark borers are the most common insect pests of lanzones. The caterpillars of the carpenter moth (Cossus sp.) and the green moth (Prasinoxema sp.) cause the scraggy appearance of the dead branches. Control of these pests include the scraping of the affected branches and painting with insecticides. Other borers affect the trunk, fruit and twigs. Other insect pests are scales, mites, leaf miners, leaf rollers, beetles and bugs.

It is also in the trunk and i don't want to cut there, i cut all branches with it but that did not help for long.

Interesting, I have had some problems with baccaruea bark that sound like that although the trees rebounded. I am losing a duku tree right now, itís been one major branch at a time over a couple of years. Itís still a mystery to us whatís causing it.

This thread has jumped around a bit without anyone attempting to respond directly to the initial question!?!

Ordered in 5 trees today, Longgong Yongmas grafted onto Langsat from seed. Directly from Narithiwat, so my Yawi Longgong coming straight from the Yawi source. A bit more money then buying locally, but the trees looked bigger and healthier, and prefer it coming from a Yawi in Narithiwat.

Generally langsat is the most cold hardy, followed by longkong, duku-langsat and duku, judging by where they are grown.I have longkong,duku-langsat and duku in flower now. The duku is prone to a corky bark condition but fruit are still ok.